A metal detector apparatus having a balanced coil system, a receiver unit, a drive coil with at least one capacitor forming a series resonant circuit connected to a transmitter unit having a converter, and a drive controller. The metal detector apparatus configuration generates a first square wave signal set to a fixed/selectable operating frequency which is applied to a first drive switch connected on one side to a first voltage potential and on another side to a centre tap of a half-bridge circuit. A second square wave signal set is generated to the fixed/selectable operating frequency and is applied to a second drive switch connected on one side to a second voltage potential and on another side to the centre tap, via which a drive current is supplied to the drive coil.

Signal generation devices including an auto-tuning electronic circuit module for generating tuned output signals are disclosed. The auto-tuning electronic circuit module may include a tunable resonant electronic circuit element for providing a tuned output signal, including a voltage divider element and a tuning array element and control element.

Signal generation devices including an auto-tuning electronic circuit module for generating tuned output signals are disclosed. The auto-tuning electronic circuit module may include a tunable resonant electronic circuit element for providing a tuned output signal, including a voltage divider element and a tuning array element and control element.

A method includes receiving, from a plurality of magnetic field receivers including magnetic sensors, data characterizing samples obtained by the plurality of magnetic field receivers, the samples of a combination of a first magnetic field and a second magnetic field resulting from interaction of the first magnetic field and an object; determining, using the received data, a polarizability index of the object, the polarizability index characterizing a magnetic polarizability property of the object; classifying, using the determined polarizability index, the object as threat or non-threat; and providing the classification. Related apparatus, systems, techniques, and articles are also described.

A power transmission apparatus 100 wirelessly transmits power to a power receiving device 102 via a power transmission coil 304, measures a Q factor of the power transmission coil 304 in the time domain, and determines presence or absence of an object (foreign object) different from the power receiving apparatus 102 based on the Q factor measured in the time domain and a reference value of the Q factor which is based on information obtained from the power receiving apparatus 102.

The disclosure includes a foreign object detection circuit and a foreign object detection method. The method comprises: step a) establishing a communication link between a transmitter and a receiver in a wireless power transmission system; step b) performing, by the transmitter and the receiver, wireless power transmission based on the magnetic coupling; and step c) measuring a quality factor of a receiver terminal, and determining whether a foreign object exists in the wireless power transmission system or not based on the quality factor. In accordance with a foreign object detection circuit and a foreign object detection method provided by the present invention, the problem that the foreign object cannot be detected effectively in the prior art is solved.

The disclosure includes a foreign object detection circuit and a foreign object detection method. The method comprises: step a) establishing a communication link between a transmitter and a receiver in a wireless power transmission system; step b) performing, by the transmitter and the receiver, wireless power transmission based on the magnetic coupling; and step c) measuring a quality factor of a receiver terminal, and determining whether a foreign object exists in the wireless power transmission system or not based on the quality factor. In accordance with a foreign object detection circuit and a foreign object detection method provided by the present invention, the problem that the foreign object cannot be detected effectively in the prior art is solved.

The invention relates to an actuating device (10) for triggering a function of a vehicle (1) by a user, having an electronics unit (12) with a sensor unit (20) for detecting an actuation action (200) of the user for triggering the function of the vehicle (1), an electronics outer side (12.2) on which the actuation action (200) of the user can be detected by the sensor unit (20), and an electronics inner side (12.1) which is opposite the electronics outer side (12.2). Furthermore, the invention relates to a vehicle (1), as well as to a method (100).

The invention relates to an actuating device (10) for triggering a function of a vehicle (1) by a user, having an electronics unit (12) with a sensor unit (20) for detecting an actuation action (200) of the user for triggering the function of the vehicle (1), an electronics outer side (12.2) on which the actuation action (200) of the user can be detected by the sensor unit (20), and an electronics inner side (12.1) which is opposite the electronics outer side (12.2). Furthermore, the invention relates to a vehicle (1), as well as to a method (100).

The invention concerns a system (1) and a method for scanning a person (2) before access to a restricted access area (3), comprising a processing unit (14) and a metal detector (10, 70) for detecting metal in the shoes (20) or in a waist portion of the person walking on a surface (15). The processing unit controls an indication unit (12, 13) for: letting the person walk towards the restricted area if a first scan indicates the probability of the presence of metal lower than a first threshold; in case of a probability higher than the first threshold, prompting the person to carry out a second scan close to a mark (11) on the carpet; and prompting the user to remove his shoes or object if the first scan indicates a probability higher than a second threshold, or if the second scan indicates a probability higher than a third threshold.